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SY89838UMG-TR

Description
Clock Multiplexer 8-OUT 2-IN 1:8 32-Pin QFN EP T/R
File Size556KB,16 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
Environmental Compliance
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SY89838UMG-TR Overview

Clock Multiplexer 8-OUT 2-IN 1:8 32-Pin QFN EP T/R

SY89838UMG-TR Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
TypeClock Multiplexer
Fanout1:8
Number of Outputs per Chip8
Maximum Propagation Delay Time @ Maximum CL (ns)0.95@2.5V
Absolute Propagation Delay Time (ns)1
Input Logic LevelCML|LVDS|PECL
Output Logic LevelLVDS
Minimum Operating Supply Voltage (V)2.375
Typical Operating Supply Voltage (V)2.5
Maximum Operating Supply Voltage (V)2.625
Maximum Quiescent Current (mA)350
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeIndustrial
PackagingTape and Reel
Pin Count32
Standard Package NameQFN
Supplier PackageQFN EP
MountingSurface Mount
Package Height0.85(Max)
Package Length5
Package Width5
PCB changed32
Lead ShapeNo Lead
SY89838U
Precision 1:8 LVDS Clock Fanout Buffer
with 2:1 Runt Pulse Eliminator Input MUX
General Description
The SY89838U is a low jitter, low skew, high-speed
1:8 fanout buffer with a unique, 2:1 differential input
multiplexer (MUX) optimized for redundant source
switchover applications. Unlike standard multiplexers,
the SY89838U unique 2:1 Runt Pulse Eliminator
(RPE) MUX prevents any short cycles or “runt” pulses
during switchover. In addition, a unique fail-safe input
protection prevents metastable conditions when the
selected input clock fails to a DC voltage (voltage
between the pins of the differential input drops below
200mV). The SY89838U distributes clock frequencies
from 1kHz to 1.5GHz, guaranteed, over temperature
and voltage.
The differential input includes Micrel’s unique, 3-pin
input termination architecture that allows customers to
interface to any differential signal (AC- or DC-coupled)
as small as 200mV (400Mv
PP
) without any level
shifting or termination resistor networks in the signal
path. The outputs are 350mV compatible LVDS with
fast rise/fall times guaranteed to be less than 150ps.
The SY89838U operates from a 2.5V ±5% supply and
is guaranteed over the full industrial temperature range
of –40°C to +85°C. For applications that require
800mV LVPECL outputs, consider the SY89837U. The
SY89838U is part of Micrel’s high-speed, Precision
®
Edge product line.
All support documentation can be found on Micrel’s
web site at:
www.micrel.com.
Features
Precision Edge
®
Selects between two clocks, and provides 8
precision, low skew LVDS output copies
2:1 MUX input provides a glitch-free, stable LVDS
output
Guaranteed AC performance over temperature and
supply voltage:
– Wide operating frequency: 1kHz to >1.5GHz
– <150ps t
r
/t
f
– <40ps output-to-output skew
Unique patent-pending input isolation design
minimizes crosstalk
Fail-safe input prevents oscillation
Ultra-low jitter design:
– 150fs RMS phase jitter
– <0.7ps
RMS
MUX crosstalk induced jitter
Unique patent-pending input termination and VT pin
accepts DC- and AC-coupled inputs (CML, PECL,
LVDS)
350mV LVDS output swing
Power supply 2.5V +5%
–40°C to +85°C industrial temperature range
Available in 32-pin (5mm x 5mm) QFN package
Applications
Redundant clock switchover
Failsafe clock protection
Markets
LAN/WAN
Enterprise Servers
ATE
Test and Measurements
United States Patent No. RE44,134
Precision Edge is a registered trademark of Micrel, Inc
May 2008
M9999-051308-D
hbwhelp@micrel.com
or (408) 955-1690

SY89838UMG-TR Related Products

SY89838UMG-TR SY89838UMG
Description Clock Multiplexer 8-OUT 2-IN 1:8 32-Pin QFN EP T/R Clock Multiplexer 8-OUT 2-IN 1:8 32-Pin QFN EP Tube
EU restricts the use of certain hazardous substances Compliant Compliant
ECCN (US) EAR99 EAR99
Part Status Active Active
HTS 8542.39.00.01 8542.39.00.01
Type Clock Multiplexer Clock Multiplexer
Fanout 1:8 1:8
Number of Outputs per Chip 8 8
Maximum Propagation Delay Time @ Maximum CL (ns) 0.95@2.5V 0.95@2.5V
Absolute Propagation Delay Time (ns) 1 1
Input Logic Level CML|LVDS|PECL PECL|LVDS|CML
Output Logic Level LVDS LVDS
Minimum Operating Supply Voltage (V) 2.375 2.375
Typical Operating Supply Voltage (V) 2.5 2.5
Maximum Operating Supply Voltage (V) 2.625 2.625
Maximum Quiescent Current (mA) 350 350
Minimum Operating Temperature (°C) -40 -40
Maximum Operating Temperature (°C) 85 85
Supplier Temperature Grade Industrial Industrial
Packaging Tape and Reel Tube
Pin Count 32 32
Standard Package Name QFN QFN
Supplier Package QFN EP QFN EP
Mounting Surface Mount Surface Mount
Package Height 0.85(Max) 0.85(Max)
Package Length 5 5
Package Width 5 5
PCB changed 32 32
Lead Shape No Lead No Lead
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